DESCRIPTION

The vm_map_find() function attempts to find a free region in the target
map, with the given length, and will also optionally create a mapping of
object.
The arguments offset, prot, max, and cow are passed unchanged to
vm_map_insert(9) when creating the mapping, if and only if a free region
is found.
If object is non-NULL, the reference count on the object must be
incremented by the caller before calling this function to account for the
new entry.
If find_space is TRUE, the function will call vm_map_findspace(9) to
discover a free region.

IMPLEMENTATIONNOTES

This function acquires a lock on map by calling vm_map_lock(9), and holds
it until the function returns.
The search for a free region is defined to be first-fit, from the address
addr onwards.

RETURNVALUES

The vm_map_find() function returns KERN_SUCCESS if space for the mapping
could be found and the mapping was successfully created. If space could
not be found in the map, KERN_NO_SPACE will be returned. If the
discovered range turned out to be bogus, KERN_INVALID_ADDRESS will be
returned.